Coupling between electronic and structural degrees of freedom in the triangular lattice conductor NaxCoO2

Q. Huang, M. L. Foo, R. A. Pascal, J. W. Lynn, B. H. Toby, Tao He, H. W. Zandbergen, R. J. Cava

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158 Scopus citations

Abstract

The ambient temperature crystal structures of compounds in the Na xCoO2 family, for 0.34<x≤1.0, determined by powder neutron diffraction, are reported. The structures consist of triangular CoO 2 layers with Na ions distributed in intervening charge reservoir layers. The shapes of the CoO6 octahedra that make up the CoO 2 layers are found to be critically dependent on the electron count and on the distribution of the Na ions in the intervening layers, where two types of Na sites are available. Correlation of the shapes of cobalt-oxygen octahedra, the Na ion positions, and the electronic phase diagram in Na xCoO2 is made, providing an example of how structural and electronic degrees of freedom can be coupled in electrically conducting triangular lattice systems.

Original languageEnglish (US)
Article number184110
Pages (from-to)1-7
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number18
DOIs
StatePublished - Nov 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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